Shank and bit punch



eating hammer piston of the machine.

Patented Aug. 31, 1926.

UNITED STATES 1,598,426 PATENT OFFICE.

JESSE DITSON, 0F LITTLETON, COLORADO, ASSIGNOR TO INGERSOLL-RANDCOMPANY, 0F JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW' JERSEY.

SHANK A ND BIT PUNCH.

Application filed July 3, 1925.

This invention relates to shank and bit punches for drill steels, butmore particularly to that type of machine in which the punch pin for thedrill steel is hammered both into and out of the drill steel.

The objects of my invention are to provide a shank and bit punch whichcan be suspended within a drill sharpening shed by a chain or otheriexible means and in which the pin carrying member, preferably in theform of an anvil block, is adapted to be driven in one direction or theother by blows of impact delivered directly to the anvil block by thefluid actuated recipro- A further object of my invention is to providemeans whereby the operator can both guide the punch and control thereciprocation of the hammer piston with one hand thereby allowing himthe use of the other hand for actuating the drill steel clampingapparatus, or for applying additional pressure on the punch either toforce the punch pin into the drill steel bore or to pull it r outtherefrom.

Further objects of the invention will hereinafter appear and to theseends the invention consists of the combinations of elements andarrangement of parts for carrying out said objects as illustrated in the.accompanying drawings, in which Figure l is a longitudinal sectionalelevation of one form of the machine,

Figure 2 is a detail sectional elevation of the valve mechanism showingthe valve in a different position,

Figure 3 is a transverse sectional View taken on the line 3-3 of Figurel looking in the direction of the arrows.

Referring to the drawings, the machine comprises the cylinder A havingthe front head B and the back head C connected by the usual throughbolts D, not seen in Figures 1 and 2 but illustrated in Figure 3.

' The cylinder is provided with a valve chest E shown containing twovalve chambers F and G, one chamber for the throttle valve H and theother chamber for the automatic pressure fluid distributing valve J forthe hammer cylinder A.

Any suitable means may be provided for clampin and holding the drillsteel K as by means oi'g the clamping jaws L and O which may be the jawson a drill sharpening machine. In the form of the machine as Serial No.41,271.

shown, the shank and bit punch is adapted to be suspended as by means ofa chain P in front of the drill steel K and by grasping the handle Q themachine is guided and pushed towards and pulled away from the drillsteel in order to permit the punch pin R tlo be driven into and out ofthe drill stoe The machine is provided with two rela tvely movableimpact members mounted in the hammer cylinder A, one of these memberscomprising the hammer piston S and the other constituting the anvil'block T in which the pin R is carried and held as by means of the keyU. The anvil block T is formed with the rearwardly extending shank Vpassing through the piston S and is also provided with the frontstriking portion or abutment W shown as a collar or shoulder and therear striking portion in the form of a nut X removably secured to thereduced screw threaded end Y of the anvil shank as by means of the capnut Z. A washer or suitable packing a is provided between the strikingportion or nut X and the securing cap nut Z.

The anvil or anvil block T as it may be termed, is guided in the fronthead B of the machine and the cap nut Z slidable in the back head Cforms a guide for the rearward portion of the anvil. The front head B isformed with an enlarged recess b to receive the collar or strikingportion W of the anvil and the back head C is likewise formed with theenlarged recess c to receive the striking portion or nut X of the anvil.

lVhen the machine is pushed towards the drill steel K, the strikingportion or nut X of the anvil is carried into the recess c in the backhead out of the path of the reciprocating hammer piston S while theforward striking portion iV of the anvil is brought into the path of thepiston and the blows of impact of the piston are delivered directly tothe anvil to hammer the pin into the steel. By pulling back on themachine the positions of the striking portions W and X of the anvil arereversed and the forward abutment lV is moved out of the path of thepiston while the rearward striking portion or nut X is moved into thepath of the piston as indicated in Figure 2 so that the blows of impactof the piston are delivered rearwardly against the striking portion X ofthe anvil and the pin is driven out of the steel by blows delivereddirectly to the anvil. I

Pressure fluid is supplied to the machine through the inlet d controlledby the throttle valve H having the valve stem e pivotally connected at fto the depending portion g of the handle Q which handle is in turnpivoted at It to the back head C. A guide pin j on the back head Centers a guide slot in the handle Q so that the handle may be rockedabout the pivot h to control the throttle valve Il and permit pressureHuid to be supplied to the. machine or shut ofl from tho machine asdesired. After the machine has been pushed forward by hand to center thepin in the drill steel, the handle Q is rocked to open the supply ofpressure fluid to the hammer cylinder. The distributing valve J may beof any suitable form but in this instance is provided with the heads o,p, g and r controlling suitable ports and passages in the valve chestfor supplying pressure fluid alternately to the ends of the hammercylinder and hausting pressure fluid therefrom as indicated by thearrows. The valve chest in this instance is provided with exhaust ports8 and t and also with the kicker ports u and 'v for operating the valveas is understood by those skilled in the art.

After the pin R has been driven into the drill steel, the machine ispulled rearwardly which removes the strikin portion IV of the anvil fromthe path o the piston and carries the striking portion X into the pathof the piston and by leaving the throttle valve H open, the hammer Sdrives the pin out of the drill steel.

I claim:

1. In a shank and bit punch for drill steels, the combination of meansfor holding the drill steel, a hammer cylinder ada ted to be flexiblysuspended within wor ing distance of the said means for holding thedrill steel, a fluid actuated reciprocating hammer piston in saidcylinder, an anvil block mounted in said cylinder and having a shankextending through the piston, a (pin carried by said anvil block andadapte to enter the drill steel, an abutment on the anvil blockforwardly of the hammer piston to receive the blows of the piston fordriving the anvil block and pin 1n one direction, another rearwardabutment on the anvil block to receive the blows of the piston fordriving the anvil block and pin in the op osite direction, a throttlevalve normally lleld closed by spring means for actuating the saidhammer piston, and a hand grip located on the said cylinder for guidingthe punch with relation to the drill steel and adapted to control thesaid throttle valve for actuating the hammer iston.

2. In a shank and bit punci for drill steels the combination of meansfor clamping the drill steel, a hammer cylinder adapted to be flexiblysuspended in the same longitudinal plane as the said drill steelclamping means and within a suitable working distance therefrom, a Huidactuated reciprocating hammer piston in said cylinder, an anvil blockmounted in said cg'linder and having a shank extending t rough thepiston, a pin carried by said anvil block and adapted to enter the drillsteel, an abutment on the anvil block forwardly of the hammer piston toreceive the blows of the piston for driving the anvil block and pin inthe opposite direction, a throttle valve for controlling thereciprocation of the piston, spring means for nor mally holding thethrottle valve closed, a grip attached to the cylinder for manuallydriving the cylinder towards the drill steel or for withdrawing it fromthe drill steel, and means connecting the said handle with the throttlevalve whereby manual force a plied either to drive the cylinder towar sthe drill steel or to Withdraw it from the drill steel will open thethrottle valve and cause reciprocation of the piston.

In testimony whereof I have signed this specification.

JESSE DITSON.

